CN101728755A - Linear-cavity optical fiber regenerative amplifier - Google Patents
Linear-cavity optical fiber regenerative amplifier Download PDFInfo
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- CN101728755A CN101728755A CN200910226536A CN200910226536A CN101728755A CN 101728755 A CN101728755 A CN 101728755A CN 200910226536 A CN200910226536 A CN 200910226536A CN 200910226536 A CN200910226536 A CN 200910226536A CN 101728755 A CN101728755 A CN 101728755A
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Abstract
The invention discloses a linear-cavity optical fiber regenerative amplifier, and relates to a laser. Doped fibers are adopted to replace a working substance of the traditional linear-cavity regenerative amplifier, such as laser crystals or glass; and a control circuit can regeneratively amplify signal-pulses with different energies and different wavelengths to acquire the maximum output power automatically, and the manual control of a second pockels cell is not needed any more. In the linear-cavity optical fiber regenerative amplifier, signal light passes through the working substance for multiple times, so the pump light is fully utilized and the pumping efficiency is improved. The linear-cavity optical fiber regenerative amplifier is suitable for obtaining high power or energy polarization pulse light output by passing light pulses through various doped optical fibers.
Description
Technical field
The present invention relates to a kind of laser, the particularly a kind of linear-cavity optical fiber regenerative amplifier that can control the acquisition maximum output energy automatically.It can control the round number of times of light pulse in the chamber automatically, obtains maximum output energy.
Background technology
Regenerative amplifier (Regenerative Amplifier) can be used as a kind of effective means that produces high stability, high-peak power, ultrashort synchronized laser pulse, even under higher repetition rate, also can provide high gain (～60dB), and the time waveform of introducing distortion and additional noise are all very little.Therefore the regenerative amplifier prospect that is widely used.
In many intensity lasers source, for example inertial confinement fusion laser (ICF) installs, and laser nuclear blast simulation etc. because the oscillator of pulse laser system generally can only provide weak seed light, need to amplify the raising pulsed laser energy through one or more levels amplifier.So it is very important that high efficiency preamplifier stage seems, it is that can decision effectively bring up to the Primary Component of certain level with the energy of waiting to amplify light pulse in the device of high power laser.Regenerative amplifier is fit to amplify weak signal light very much, and can obtain high gain (＞60dB), it is laser pre-amplifier commonly used, the feature that regenerative amplifier is different from traditional travelling-wave amplifier is that multipass amplifies, and the regenerative amplification process comprises three parts: seed pulse injects resonant cavity, multipass amplifies and cavity dumping.Regenerative amplifier is the stored energy of high efficiency extraction laser medium in a large number, realizes that the high-gain of the some orders of magnitude of small-signal laser pulse is amplified.The use of laser diode (LD) pumping source has further promoted the development of regenerative amplifier.Compare with the flash lamp pumping source, the amplifier of laser diode pumped is more reliable and stable, compact conformation, and improved system effectiveness, reduced heat dissipation, and long working life.The regenerative amplifier of laser diode pumped is widely used in the nanosecond laser pulses amplification and ultrashort laser pulse is amplified.
Yet traditional regenerative amplifier all with laser crystal or laser glass as operation material, as neodymium glass, Nd:YAG and titanium gem crystal, their each have their own characteristics, with the neodymium glass is example: the neodymium glass ratio is easier to growth, can obtain the large scale quality material, and can carry out pumping with photoflash lamp, therefore be easier to obtain the laser output of macro-energy, but neodymium glass is in that short pulse to be amplified narrowing of especially gaining in regenerative amplifier quite serious, and system can only obtain the pulse of hundreds of femtoseconds.
Increasingly mature along with the semiconductor laser production technology of doped fiber manufacturing and different wave length, the optical-fiber laser device that with the doped fiber is laser medium is because the conversion efficiency height, good beam quality, many and the tuning convenience of output wavelength, compact conformation is small and exquisite, temperature stability is good, and compatible good (can produce the laser system of full optical fibre device) can be competent at numerous advantages such as bad working environment and more and more cause people's attention.
Research such as ytterbium doped optical fiber amplifier is exactly a focus of optical-fiber laser device.Compare with other Solid Laser Elements, advantage such as fiber amplifier is little, in light weight owing to compact conformation, perfect heat-dissipating, volume, good beam quality is subjected to paying close attention to widely.In doped optical fibre amplifier, ytterbium doped optical fiber amplifier is not owing to gain spectrum width, efficient height, have the characteristics such as excited state absorption of other dopant ions, doping content also can be very high, there is not concentration quenching under high doping, just can realize bigger gain with short length, so more and more obtain people's attention in the application aspect the high-power amplification.Ytterbium doped optical fiber amplifier is laser communications, military affairs, medical treatment, industrial having a wide range of applications.
Traditional fiber amplifier is to adopt one-level or multistage amplification [(1) Ultrashot-pulseYb3+-fiber-based laser and amplifier system producing＞25w averager power, Andrew Malinowski, Opt.Lett.vol.29.2073-2075,2004], round trip is amplified [(3) JeffreyP.Koplow, Dahv A.V.Kliner, Lew Goldberg, UV generation by frequency quadruplingof a Yb-doped fiber amplifier, IEEE photonics technology lett.1998,10 (1): 75-77; (4) Anting Wang, Meishu Xing, Guanghui Chen, Wenkui Yang, Hai Ming, JianpingXie, Yun Wu, Double-pass ytterbium-doped fiber amplifier with high gain coefficientand low noise figure, 2003,1 (9): 532-535] etc. means obtain the laser output of high power (gain).
Summary of the invention
Technical problem to be solved by this invention provides a kind of linear-cavity optical fiber regenerative amplifier, can make full use of pump light, improve pumping efficiency, adopt doped fiber to replace traditional operation materials such as laser crystal, obtain higher gain, and can obtain maximum power output automatically by control.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of linear-cavity optical fiber regenerative amplifier, comprise the polarization signal source, be provided with second speculum, first Pockers cell, film polarizer, second Pockers cell, doped fiber and double color plate in the line style chamber;
Polarization signal source, 1/2nd wave plates, first isolator, the 3rd speculum, film polarizer, first Pockers cell, second speculum, second Pockers cell, doped fiber and double color plate are formed a light path;
Pumping source is communicated with double color plate light by second isolator;
Film polarizer is communicated with the first speculum light;
First speculum is communicated with PIN pipe light;
Control circuit is electrically connected with the PIN pipe and second Pockers cell by coaxial cable.
Described doped fiber is between second speculum and the film polarizer or between second Pockers cell and the double color plate.
Described doped fiber comprises er-doped, neodymium-doped, mixes ytterbium, mixes thulium and er-doped-ytterbium optical fiber etc.
Described 1/2nd wave plates are achromatic waveplate.
Described first speculum, second speculum, the 3rd speculum and double color plate are broadband mirrors.
In the described control circuit, the energy of round trip output is greater than the preceding once energy of output in the online die cavity of back pulsatile once, then control circuit is output as 0, otherwise is output as 1/4 wave voltage of second Pockers cell, notes the best frequency n that comes and goes in the online die cavity of pulse simultaneously; After second wave pulse signal injects the line style chamber, when coming and going n time in the chamber, exports the control circuit count pulse 1/4 wave voltage of second Pockers cell.
A kind of linear-cavity optical fiber regenerative amplifier provided by the invention, by adopting doped fiber to replace the operation material of traditional linear cavity regenerative amplifier, as laser crystal or glass, and can be to different-energy by a control circuit, the signal pulse of different wave length carries out regenerative amplification, automatically obtain peak power output, not in artificial second Pockers cell is controlled of needs.Linear-cavity optical fiber regenerative amplifier can make full use of pump light owing to allow flashlight repeatedly by operation material, improves pumping efficiency.Be applicable to that light pulse obtains the polarized pulses light output of high power or energy by various doped fibers.
Description of drawings
Fig. 1 is an overall structure schematic diagram of the present invention.
Embodiment
In Fig. 1, a kind of linear-cavity optical fiber regenerative amplifier comprises polarization signal source 12, is provided with second speculum 4, first Pockers cell 5, film polarizer 6, second Pockers cell 10, doped fiber 11 and double color plate 13 in the line style chamber;
First speculum 1 is managed 2 light with PIN and is communicated with;
Described doped fiber 11 is between second speculum 4 and the film polarizer 6 or between second Pockers cell 10 and the double color plate 13.
Described doped fiber 11 end faces polish with 7 °-15 ° angle.The end face of doped fiber 11 need grind to form certain angle in order to avoid cause laser generation.
Described doped fiber 11 comprises er-doped, neodymium-doped, mixes ytterbium, mixes thulium and er-doped-ytterbium optical fiber etc.
Described 1/2nd wave plates 9 are achromatic waveplate./ 2nd wave plates 9 can be adjusted the polarization direction of seed pulse to satisfy the demand, and described first speculum 1, the second speculum, 4, the three speculums 7 and double color plate 13 are broadband mirrors.Can carry out regenerative amplification to the different wave length flashlight like this,
In the described control circuit 3, the energy of round trip output is greater than the preceding once energy of output in the online die cavity of back pulsatile once, then control circuit 3 is output as 0, otherwise is output as 1/4 wave voltage of second Pockers cell 10, notes the best frequency n that comes and goes in the online die cavity of pulse simultaneously; After second wave pulse signal injects the line style chamber, when coming and going n time in the chamber, export control circuit 3 count pulses 1/4 wave voltage of second Pockers cell 10.
The linearly polarized light pulse of 12 outputs from the polarization signal source, successively through 1/2nd wave plates 9, first isolator 8, the 3rd speculum 7, make that the polarization direction of light pulse is the p polarization, first Pockers cell 5 passes first Pockers cell 5 once more after 4 reflections of second speculum, owing to apply 1/4 wave voltage on first Pockers cell 5 before always, seed pulse becomes the s polarization from the p polarization, and remove the voltage on first Pockers cell 5 this moment, and the polarization state of seed pulse no longer changes like this.Signal pulse is through second Pockers cell 10, doped fiber 11, reflected by double color plate 13, and seed pulse comes back reflective between two chamber mirrors like this.The every round trip of light pulse, through gain media twice, energy constantly amplifies.Along with the increase of amplifying number of times, pulse energy is increasing, and inverted population is fewer and feweri, the step-down gradually that gains, the round number of times of the best of existence.Because film polarizer 6 has certain transmitance, a spot of light is through first speculum 1, by 2 receptions of PIN pipe, in the chamber, come and go an energy that feeds back out greater than the preceding once energy of output as the back pulsatile once, then control circuit is output as 0, otherwise be output as 1/4 wave voltage of second Pockers cell 10, and note the best frequency n that pulse comes and goes in amplifier; After the line style chamber is injected in back one wave impulse, 3 needs of control circuit are exported 1/4 wave voltage of second Pockers cell 10 when pulse comes and goes n time in the chamber, so laser pulse becomes the p polarization from the s polarization again, seeing through film polarizer 6 pours out from the line style chamber, obtain maximum output energy, the regenerative amplification process finishes.
Because the polarization signal pulse repeatedly by being in the doped fiber of population inversion, has improved the conversion efficiency of pump light greatly in the chamber, under same condition, can obtain bigger output energy or power with the optical fiber of equal length.
If ultrashort pulse is when amplifying, then before amplification, need to pass through grating pair, perhaps prism equity optics carries out broadening to ultrashort polarized optical pulse, when avoiding amplifying ultrashort pulse, and the nonlinear effect that high-peak power causes and to the damage of optics; Equally also can pass through grating pair after amplifying output, prism equity optics compresses light pulse.
Claims (6)
1. linear-cavity optical fiber regenerative amplifier, comprise polarization signal source (12), it is characterized in that: be provided with second speculum (4), first Pockers cell (5), film polarizer (6), second Pockers cell (10), doped fiber (11) and double color plate (13) in the line style chamber;
Polarization signal source (12), 1/2nd wave plates (9), first isolator (8), the 3rd speculum (7), film polarizer (6), first Pockers cell (5), second speculum (4), second Pockers cell (10), doped fiber (11) and double color plate (13) are formed a light path;
Pumping source (15) is communicated with double color plate (13) light by second isolator (14);
Film polarizer (6) is communicated with first speculum (1) light;
First speculum (1) is communicated with PIN pipe (2) light;
Control circuit (3) is electrically connected with PIN pipe (2) and second Pockers cell (10) by coaxial cable (16).
2. a kind of linear-cavity optical fiber regenerative amplifier according to claim 1 is characterized in that: described doped fiber (11) is positioned between second speculum (4) and the film polarizer (6) or between second Pockers cell (10) and the double color plate (13).
3. a kind of linear-cavity optical fiber regenerative amplifier according to claim 1 and 2 is characterized in that: described doped fiber (11) comprises er-doped, neodymium-doped, mixes ytterbium, mixes thulium and er-doped-ytterbium optical fiber etc.
4. a kind of linear-cavity optical fiber regenerative amplifier according to claim 1 is characterized in that: described 1/2nd wave plates (9) are achromatic waveplate.
5. a kind of linear-cavity optical fiber regenerative amplifier according to claim 1 is characterized in that: described first speculum (1), and second speculum (4), the 3rd speculum (7) and double color plate (13) they are broadband mirrors.
6. a kind of linear-cavity optical fiber regenerative amplifier according to claim 1, it is characterized in that: in the described control circuit (3), the energy of round trip output is greater than the preceding once energy of output in the online die cavity of back pulsatile once, then control circuit (3) is output as 0, otherwise be output as 1/4 wave voltage of second Pockers cell 10, note the best frequency n that comes and goes in the online die cavity of pulse simultaneously; After second wave pulse signal injects the line style chamber, when coming and going n time in the chamber, exports control circuit (3) count pulse 1/4 wave voltage of second Pockers cell 10.
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| CN200910226536A CN101728755A (en) | 2009-11-22 | 2009-11-22 | Linear-cavity optical fiber regenerative amplifier |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102201644A (en) * | 2011-04-07 | 2011-09-28 | 中国科学院上海光学精密机械研究所 | Low-temperature Yb: yttrium aluminum garnet (YAG) regenerative amplifier |
| CN102646921A (en) * | 2012-04-16 | 2012-08-22 | 北京国科世纪激光技术有限公司 | Neodymium glass regenerative amplifier |
| CN102709801A (en) * | 2012-06-04 | 2012-10-03 | 中国科学院半导体研究所 | Laser capable of simultaneously outputting nanosecond pulses and pico-second pulses |
| CN103682973A (en) * | 2013-12-04 | 2014-03-26 | 中国科学院上海光学精密机械研究所 | Optical fiber and space mixing regeneration laser amplifier |
| CN106848826A (en) * | 2017-01-12 | 2017-06-13 | 中国科学院光电研究院 | A kind of pair of electro-optical Q-switch regenerative amplification device |
| CN110718844A (en) * | 2019-10-12 | 2020-01-21 | 中国工程物理研究院激光聚变研究中心 | Laser energy stable amplification control device and control method |
-
2009
- 2009-11-22 CN CN200910226536A patent/CN101728755A/en active Pending
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102201644A (en) * | 2011-04-07 | 2011-09-28 | 中国科学院上海光学精密机械研究所 | Low-temperature Yb: yttrium aluminum garnet (YAG) regenerative amplifier |
| CN102646921A (en) * | 2012-04-16 | 2012-08-22 | 北京国科世纪激光技术有限公司 | Neodymium glass regenerative amplifier |
| CN102709801A (en) * | 2012-06-04 | 2012-10-03 | 中国科学院半导体研究所 | Laser capable of simultaneously outputting nanosecond pulses and pico-second pulses |
| CN102709801B (en) * | 2012-06-04 | 2013-09-04 | 中国科学院半导体研究所 | Laser capable of simultaneously outputting nanosecond pulses and pico-second pulses |
| CN103682973A (en) * | 2013-12-04 | 2014-03-26 | 中国科学院上海光学精密机械研究所 | Optical fiber and space mixing regeneration laser amplifier |
| CN103682973B (en) * | 2013-12-04 | 2016-06-08 | 中国科学院上海光学精密机械研究所 | The regenerative laser amplifier that mix in optical fiber and space |
| CN106848826A (en) * | 2017-01-12 | 2017-06-13 | 中国科学院光电研究院 | A kind of pair of electro-optical Q-switch regenerative amplification device |
| CN106848826B (en) * | 2017-01-12 | 2019-04-09 | 中国科学院光电研究院 | A kind of double electro-optical Q-switch regenerative amplification devices |
| CN110718844A (en) * | 2019-10-12 | 2020-01-21 | 中国工程物理研究院激光聚变研究中心 | Laser energy stable amplification control device and control method |
| CN110718844B (en) * | 2019-10-12 | 2021-08-10 | 中国工程物理研究院激光聚变研究中心 | Laser energy stable amplification control device and control method |
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Application publication date: 20100609 |